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South Africa's Louis Oosthuizen fired an eight-under par 63 to seize a three-shot lead after three rounds of the US PGA Tour's Deutsche Bank Championship in Boston.
Oosthuizen birdied seven holes in a row from the fourth for a 54-hole total of 19-under par 194.
Oosthuizen surged past overnight leader and playing partner Rory McIlroy who carded a 67 tie lied second on 197.
Tiger Woods carded a 68 for a share of third place on 13-under alongside fellow American Dustin Johnson.
